servlet实现简单的反向代理

项目基于Spring
须要的依赖为：

<dependency>
    <groupId>org.mitre.dsmiley.httpproxy</groupId>
    <artifactId>smiley-http-proxy-servlet</artifactId>
    <version>1.7</version>
</dependency>

只需要添加一个java文件即可，原理有待继续研究

package *.*.*.*;

import org.mitre.dsmiley.httpproxy.ProxyServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * Created by czz on 2018/11/13.
 */
@Configuration
public class SolrProxyServletConfiguration {
    @Bean
    public ServletRegistrationBean servletRegistrationBean(){
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new ProxyServlet(), "/s/*");
        servletRegistrationBean.addInitParameter("targetUri", "http://www.baidu.com/s");
        servletRegistrationBean.addInitParameter(ProxyServlet.P_LOG, "false");
        return servletRegistrationBean;
    }
}

还可以通过配置多个bean来达到代理多个服务的目的

package *.*.*.*;

import org.mitre.dsmiley.httpproxy.ProxyServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * Created by czz on 2018/11/13.
 */
@Configuration
public class SolrProxyServletConfiguration {
    @Bean
    public ServletRegistrationBean servletRegistrationBean(){
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new ProxyServlet(), "/s/*");
        servletRegistrationBean.setName("baidu");
        servletRegistrationBean.addInitParameter("targetUri", "http://www.baidu.com/s");
        servletRegistrationBean.addInitParameter(ProxyServlet.P_LOG, "false");
        return servletRegistrationBean;
    }

    @Bean
    public ServletRegistrationBean servletRegistrationBean1(){
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new ProxyServlet(), "/bootstrap/*");
        servletRegistrationBean.setName("runoob");
        servletRegistrationBean.addInitParameter("targetUri", "http://www.runoob.com/bootstrap");
        servletRegistrationBean.addInitParameter(ProxyServlet.P_LOG, "false");
        return servletRegistrationBean;
    }

    @Bean
    public ServletRegistrationBean servletRegistrationBean2(){
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new ProxyServlet(), "/otheragent/*");
        servletRegistrationBean.setName("***");
        servletRegistrationBean.addInitParameter("targetUri", "http://***/otheragent");
        servletRegistrationBean.addInitParameter(ProxyServlet.P_LOG, "false");
        return servletRegistrationBean;
    }
}

参考文章：Spring boot使用ProxyFilter进行服务代理